Local reality: Can it exist in the EPR-Bohmgedanken experiment?

Stellan Welin

Boon Leong Lan

智 内山, Satoshi Uchiyama

Local Reality Can Exist in the EPR-Bohm Gedanken ExperimentConsiderations based on the mechanistic quantum theory show that the local reality can exist even if Bell' s inequality is violated in the EPR-Bohm Gedanken experiment.Quantum mechanical states are interpreted as periodic trajectories in phase space.In the measurement, periodic trajectories are assumed to undergo a recoverable deformation.Moreover, the statistical results of the measurement can be the same even if they undergo different deformations.It is possible that periodic trajectories undergoing different deformations are not in the same state; however, their state changes spontaneously.If it changes spontaneously, we show that it can be said that local reality exists even if it does not have the locality assumed in the derivation of Bell' s inequality.

F. Selleri

V. K. Thankappan, Ravi K. Menon

The concept of elements of physical reality (e.p.r.) in quantum mechanics as defined by Einstein, Podolsky and Rosen (EPR) is discussed in the context of the EPR–Bohm and the EPR–Bell experiments on a pair of spin 1/2 particles in the singlet state. It is argued that EPR's definition of e.p.r. is appropriate to the EPR–Bell experiment rather than to the EPR–Bohm experiment, and that Bohr's interpretation of e.p.r. is also consistent with such a viewpoint. It is shown that the observed correlation between the spins of the two particles in the EPR–Bell experiment is just a manifestation of the correlation that exists between the wave functions of the particles in the singlet state and a consequence of the fact that a Stern–Gerlach magnet does not change the state of a particle but only transforms its wave function into a representation defined by the axis of the magnet. As such, the correlation is suggested to be an affirmation of Einstein's concept of locality, and not an evidence for nonlocality.

M. A. B. Whitaker, J.G. Dennison